added: serial_ascii_binary app
serial_ascii_binary app: Moved the big comment to the top.
serial_ascii_binary app: A few changes to the comments to make it more clear which interface is for ASCII and which is for binary for someone who just wants the information fast.  Also fixed the conversion to lower case so it is only done in the correct place.  Also got rid of unused static variables.
serial_ascii_binary app: Improved some other comments.